dyno port exhaust?

[coreyownz]

what do you guys think of this pipe? what jet you think id run?
eBay Motors: YAMAHA 200 BLASTER EXHAUST PIPE & SILENCER KIT 87-06 (item 130224566339 end time Sep-18-08 13:25:02 PDT)

 

[blasterboy91]

i though you were only suposed ta run those with big bore kits...? am i rong?

 

[con8quest6]

i run a dyno port exhaust (love it), but yeah, its supposedly not for motors that arent heavily moddified (so they say).